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I attempted to download HijackThis, from the link on BleepingComputer. I am told that the download was complete. However, when I click on the icon on my desktop to complete the install, a window appears "Open With". What do I do next.?

Which operating system are you using? The HJT file needs to be extracted to its own folder. If you're using XP, you should be able to right-click the file and choose to Extract All, and then a wizard will open. Click "Next" and click the Browse button. Click the plus sign on "My Computer," click on the C: drive, which will probably be "local disk C:" - not the plus sign, but the words - and then click on the "make new folder" button.

You will see "new folder" highlighted in blue. Replace the words "new folder" with HJT and hit enter. Click OK. Make sure the box is checked for "show extracted files," and click Finish. A new folder will open with HijackThis! ready to run.

If you are using a different operating system, the instructions will be different. For instance, if you are using Windows 98, you will need to download a third-party tool to unzip the file, such as Winzip. HijackThis! needs to be in its own folder to work properly, not a temporary folder and not run zipped from the desktop. It makes backups of what it fixes and if you later have to delete the contents of your temporary folders, those backups would be gone.